following is my code 



    #include <avr/io.h>
    #include <util/delay.h>
    
    #define Delay_ms(x) _delay_ms(x)
    #define RS   1       //PC0
    #define RW   1       //PC1
    #define EN   2       //PC2
    
    
    void lcd_cmnd(unsigned char);
    void lcd_data(unsigned char dta);
    
    
    int main()
    {
    	DDRC=0xff;
    	DDRD=0xff;
    	lcd_cmnd(0x38);          //sets 8-bit interacing
    	Delay_ms(1);
    
    
    	lcd_cmnd(0x0e);           //display on
    	Delay_ms(1);
    	lcd_cmnd(0x08);           //display off
    	Delay_ms(1);
    	lcd_cmnd(0x01);        //clears screen
    	Delay_ms(1);
    
    
    
    	lcd_cmnd(0b00000000);
    	lcd_cmnd(0x06);	//Entry Mode, Increment cursor position, No display shift
    
    	lcd_data('N');
    	Delay_ms(250);
    
    	lcd_data('a');
    	Delay_ms(25);
    	lcd_data('s');
    	Delay_ms(25);
    	lcd_data('i');
    	Delay_ms(25);
    	lcd_data('r');
    	Delay_ms(25);
    return 0;
    }
    void lcd_cmnd(unsigned char cmd)
    {
    	PORTD=cmd;
    	PORTC=(0<<RS);                //command mode   PC0=RS(low)
    	PORTC|=(0<<RW);                // read mode  PC1=RW
    	PORTC=(1<<EN);                 // enable high   PC2=EN
    	Delay_ms(1);
    	PORTC=(0<<EN);                 //enable low
    	Delay_ms(50);
    }
    
    void lcd_data(unsigned char dta)
    {
    
    	PORTC|=(0<<RW);              //PC1=RW (low)
    	PORTC|=(1<<0);               //DATA mode   PC0=RS
    	PORTD=dta;
    	PORTC=(1<<EN);                //enable high   PC2=EN
    
    
    	Delay_ms(1);
    	PORTC=(0<<EN);                //enable low
    	Delay_ms(50);
    }
    
    it executes well, the simulation in proteus runs well but the characters are not shown. hte cursor just blinks and nothing is displayed. i dont know why? 
    
    following is another code which runs good and every thing is displayed on lcd as "Hllo World!"
    
    
    #include <avr/io.h>
    #include <stdlib.h>
    #include <util/delay.h>
    #include <stdio.h>
    
    //Define functions
    //==========================================================
    void io_init(void);                         //Initializes IO
    void send_nibble(unsigned char __rs, unsigned char __data);
    
    //==========================================================
    
    int main (void)
    {
        io_init();
    
       _delay_ms(15);
       send_nibble(0,0b0010);   //Set to 4 bit operation (note: 1 nibble operation)
       _delay_ms(5);
    
       send_nibble(0,0b0010);   //Function set, 4 bit
       send_nibble(0,0x08);		//display off, cursor off
    
       send_nibble(0,0b0000);
       send_nibble(0,0b1111);	//Display ON, Cursor On, Cursor Blinking
    
       send_nibble(0,0b0000);
       send_nibble(0,0b0001);	//Clear Display
    
       send_nibble(0,0b0000);
       send_nibble(0,0x06);	//Entry Mode, Increment cursor position, No display shift
    
       send_nibble(1,0b0100);  //H
       send_nibble(1,0b1000);
    
       send_nibble(1,0b0110);  //e
       send_nibble(1,0b0101);
    
       send_nibble(1,0b0110);  //l
       send_nibble(1,0b1100);
    
       send_nibble(1,0b0110);  //l
       send_nibble(1,0b1100);
    
       send_nibble(1,0b0110);  //o
       send_nibble(1,0b1111);
    
       send_nibble(1,0b0010);  //Space
       send_nibble(1,0b0000);
    
       send_nibble(1,0b0101);  //w
       send_nibble(1,0b0111);
    
       send_nibble(1,0b0110);  //o
       send_nibble(1,0b1111);
    
       send_nibble(1,0b0111);  //r
       send_nibble(1,0b0010);
    
       send_nibble(1,0b0110);  //l
       send_nibble(1,0b1100);
    
       send_nibble(1,0b0110);  //d
       send_nibble(1,0b0100);
    
        return(0);
    }
    
    void io_init (void)
    {
        /*
        PC 7: N/A
        PC 6: Reset
        PC 5: Enable
        PC 4: Register Select
        PC 3: Data 7
        PC 2: Data 6
        PC 1: Data 5
        PC 0: Data 4
        */
    
        DDRC = 0b00111111;  //63
    }
    
    void send_nibble(unsigned char __rs, unsigned char __data)
    {
       PORTC = (__rs<<4) | __data | 0b00100000;      // Set RS &amp; Data. Set EN=High
       _delay_ms(1);
       PORTC = (__rs<<4) | __data;                   // Set RS &amp; Data. Set EN=Low
       _delay_ms(1);
    }

i tried to proceed in same order but in vain. and i am stuck in learning the lcd programming from last 10 days. any healthy and effective help is appreciated in advance!

Thanx!